<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <!-- 安全策略 -->
  <meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'" />
  <meta http-equiv="X-Content-Security-Policy" content="default-src 'self'; script-src 'self'" />
  <title>Document</title>
</head>

<body>
  <h1>Hello World123</h1>
  <button id="btn">点击</button>
<br>
<br>
<input type="text" id="input">
<button id="btn2">写入文件</button>
<br>
<br>
<button id="btn3">读取文件</button>
<script type="text/javascript" src="./render.js"></script>
</body>

</html>